import FOV, { VisibilityCallback } from "./fov.js";
/**
 * @class Recursive shadowcasting algorithm
 * Currently only supports 4/8 topologies, not hexagonal.
 * Based on Peter Harkins' implementation of Björn Bergström's algorithm described here: http://www.roguebasin.com/index.php?title=FOV_using_recursive_shadowcasting
 * @augments ROT.FOV
 */
export default class RecursiveShadowcasting extends FOV {
    /**
     * Compute visibility for a 360-degree circle
     * @param {int} x
     * @param {int} y
     * @param {int} R Maximum visibility radius
     * @param {function} callback
     */
    compute(x: number, y: number, R: number, callback: VisibilityCallback): void;
    /**
     * Compute visibility for a 180-degree arc
     * @param {int} x
     * @param {int} y
     * @param {int} R Maximum visibility radius
     * @param {int} dir Direction to look in (expressed in a ROT.DIRS value);
     * @param {function} callback
     */
    compute180(x: number, y: number, R: number, dir: number, callback: VisibilityCallback): void;
    /**
     * Compute visibility for a 90-degree arc
     * @param {int} x
     * @param {int} y
     * @param {int} R Maximum visibility radius
     * @param {int} dir Direction to look in (expressed in a ROT.DIRS value);
     * @param {function} callback
     */
    compute90(x: number, y: number, R: number, dir: number, callback: VisibilityCallback): void;
    /**
     * Render one octant (45-degree arc) of the viewshed
     * @param {int} x
     * @param {int} y
     * @param {int} octant Octant to be rendered
     * @param {int} R Maximum visibility radius
     * @param {function} callback
     */
    _renderOctant(x: number, y: number, octant: number[], R: number, callback: VisibilityCallback): void;
    /**
     * Actually calculates the visibility
     * @param {int} startX The starting X coordinate
     * @param {int} startY The starting Y coordinate
     * @param {int} row The row to render
     * @param {float} visSlopeStart The slope to start at
     * @param {float} visSlopeEnd The slope to end at
     * @param {int} radius The radius to reach out to
     * @param {int} xx
     * @param {int} xy
     * @param {int} yx
     * @param {int} yy
     * @param {function} callback The callback to use when we hit a block that is visible
     */
    _castVisibility(startX: number, startY: number, row: number, visSlopeStart: number, visSlopeEnd: number, radius: number, xx: number, xy: number, yx: number, yy: number, callback: VisibilityCallback): void;
}